How to initialize a Unit Delay block with a Bus signal from a Data Dictionary in the Model Workspace in R2021a?

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MathWorks Support Team on 24 Sep 2021

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Answered: MathWorks Support Team on 24 Sep 2021

Accepted Answer: MathWorks Support Team

My model contains a Bus signal feeding a Unit Delay block which should be initialized:

So that Bus elements a and b have different initial conditions.

I saw that one can use the following workflows:

//www.tianjin-qmedu.com/help/simulink/ug/specifying-initial-conditions-for-bus-signals.html#bsff88y

But how can I create the MATLAB struct inside the Model Workspace which should get Bus type data from a Data Dictionary (DD). Besides this I also want to use variables/values from the Base Workspace in the MATLAB struct.

How can I do this?

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MathWorks Support Team on 24 Sep 2021

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//www.tianjin-qmedu.com/matlabcentral/answers/1459994-how-to-initialize-a-unit-delay-block-with-a-bus-signal-from-a-data-dictionary-in-the-model-workspace#answer_794209

The attached example contains the following information which solves the issue:

下面的MATLAB代码用于创建the struct:

                             initBUS = Simulink.Parameter;
                            
                             myDictionaryObj = Simulink.data.dictionary.open('testDD.sldd');
                            
                             initBUS.DataType ='Bus: myBus';
                            
                             initBUS.Value = Simulink.Bus.createMATLABStruct('myBus',[],1,myDictionaryObj);%initializes the struct using the 'scope' property to search for the type in a data dictionary
                            
                             initBUS.Value.a = evalin(" base','aVar');%gets data from Base Workspace
                            
                             initBUS.Value.b = evalin(" base'," bVar');%gets data from Base Workspace
                            
                             clearmyDictionaryObj